Allowance for Credit Losses (Details) (USD $) In Millions	3 Months Ended
Mar. 31, 2011	Mar. 31, 2010	Dec. 31, 2010
Allowance for loan losses [Abstract]
Allowance for loan losses at January 1	$ 32,266	$ 31,602
Gross charge-offs	4,344	8,451
Gross (recoveries)	(624)	(541)
Net charge-offs	3,720	7,910
Provision for loan losses	1,196	6,991
Other	8	9
Ending balance at March 31	29,750	38,186
Allowance for loan losses by impairment methodology:
Asset-specific	5,916	7,870
Formula-based	18,893	27,505
Purchased Credit Impaired	4,941	2,811
Total allowance for loan losses	29,750	38,186
Loans by impairment methodology:
Asset-specific	20,988	21,712
Formula-based	583,628	605,699
Purchased credit-impaired	70,821	79,430
Total retained loans	675,437	706,841	685,498
Wholesale [Member]
Allowance for loan losses [Abstract]
Allowance for loan losses at January 1	4,761	7,145
Gross charge-offs	253	1,014
Gross (recoveries)	(88)	(55)
Net charge-offs	165	959
Provision for loan losses	(359)	(257)
Other	(3)	1
Ending balance at March 31	4,234	5,942
Allowance for loan losses by impairment methodology:
Asset-specific	1,030	1,557
Formula-based	3,204	4,385
Purchased Credit Impaired	0	0
Total allowance for loan losses	4,234	5,942
Loans by impairment methodology:
Asset-specific	4,498	6,286
Formula-based	225,094	203,818
Purchased credit-impaired	56	107
Total retained loans	229,648	210,211
Wholesale [Member] \| Allowance for Loans and Leases Receivable [Member]
Allowance for loan losses [Abstract]
Cumulative effect of changes in accounting principles	0	14
Consumer Excluding Credit Card [Member]
Allowance for loan losses [Abstract]
Allowance for loan losses at January 1	16,471	14,785
Gross charge-offs	1,460	2,555
Gross (recoveries)	(131)	(116)
Net charge-offs	1,329	2,439
Provision for loan losses	1,329	3,736
Other	4	3
Ending balance at March 31	16,475	16,212
Allowance for loan losses by impairment methodology:
Asset-specific	1,067	911
Formula-based	10,467	12,490
Purchased Credit Impaired	4,941	2,811
Total allowance for loan losses	16,475	16,212
Loans by impairment methodology:
Asset-specific	7,254	4,406
Formula-based	242,979	263,641
Purchased credit-impaired	70,765	79,323
Total retained loans	320,998	347,370
Consumer Excluding Credit Card [Member] \| Allowance for Loans and Leases Receivable [Member]
Allowance for loan losses [Abstract]
Cumulative effect of changes in accounting principles	0	127
Credit Card [Member]
Allowance for loan losses [Abstract]
Allowance for loan losses at January 1	11,034	9,672
Gross charge-offs	2,631	4,882
Gross (recoveries)	(405)	(370)
Net charge-offs	2,226	4,512
Provision for loan losses	226	3,512
Other	7	7
Ending balance at March 31	9,041	16,032
Allowance for loan losses by impairment methodology:
Asset-specific	3,819	5,402
Formula-based	5,222	10,630
Purchased Credit Impaired	0	0
Total allowance for loan losses	9,041	16,032
Loans by impairment methodology:
Asset-specific	9,236	11,020
Formula-based	115,555	138,240
Total retained loans	124,791	149,260
Credit Card [Member] \| Allowance for Loans and Leases Receivable [Member]
Allowance for loan losses [Abstract]
Cumulative effect of changes in accounting principles	0	7,353
Allowance for Loans and Leases Receivable [Member]
Allowance for loan losses [Abstract]
Cumulative effect of changes in accounting principles	$ 0	$ 7,494

Allowance For Loan Losses Asset Specific.

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- Definition

Allowance For Loan Losses Formula Based.

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- Definition

The recorded investment in financing receivables for which impairment is determined on an asset-specific basis.

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- Definition

The recorded investment in financing receivables for which impairment is determined on a formula basis.

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- Definition

Impairment methodology.

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- Definition

Loans by impairment methodology.

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- Definition

The gross carrying amount of loans held for investment, after deducting deferred income, but before deducting the allowance for loan and lease losses.

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- Definition

Reflects the net amount of other additions and reductions in the reserve for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 20

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

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- Definition

Reflects the amount charged against earnings during the period as bad debt expense, net of recoveries of previously expensed credit losses.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Reflects the amount of loans and leases that have been removed, or charged off, from both loan receivables and the reserve for credit losses, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities.

+ References

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- Definition

For consumer loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable, that have a net carrying amount, the undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. Amounts forgiven in a debt restructuring but contingently payable to the investor should be included in the forgiven contract balance, but amounts irrevocably forgiven in a debt restructuring should not be included. Amounts payable to the investor in cash, in kind, and by any other means should be included. Amounts legally discharged should not be included. The outstanding balance does not include amounts that would be accrued under the contract as interest, fees, penalties, and other after the reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 03-3

-Paragraph 16

-Subparagraph a(1)

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- Definition

For loans and debt securities, 1) for which at acquisition it was probable that the investor would be unable to collect all contractually required payments receivable, and 2) for which it is further probable that the investor will not be able to collect all cash flows expected at acquisition (plus any additional cash flows expected due to changes in estimate after acquisition), the allowance for credit losses recorded to reflect the impairment since acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 03-3

-Paragraph 15

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 20

-Subparagraph a(1)

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- Definition

The allowance for loan and lease losses represents the reserve to cover probable credit losses related to specifically identified loans and leases, as well as probable credit losses inherent in the remainder of the loan portfolio as of the balance sheet date. For banks, include currently required allocated transfer risk reserves. Include carryover of or adjustments to the allowance for loan losses in connection with business combinations determined to be appropriate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Chapter V

-Section 563c.102

-Paragraph 8

-Subparagraph a(ii)

-Subsection I

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 20

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 8, 9

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- Definition

Amount of the cumulative effect of the change in accounting principle on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 154

-Paragraph 2, 17, 18

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- Definition

The sum of the periodic provision charged to operations, based on an assessment of the uncollectibility of the loan and lease portfolio, the offset to which is either added to or deducted from the allowance account for the purpose of reducing loan receivable and leases to an amount that approximates their net realizable value (the amount expected to be collected).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Chapter 5

-Paragraph 168, 169, 170

-IssueDate 2006-05-01

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 11

-Article 9

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- Definition

Total of recoveries of amounts due the Entity that had previously been written off as uncollectible using allowances (the valuation accounts that are netted against the cost of an asset to value it at its carrying value) and total of reestablishments of reserves (liabilities established to represent expected future costs) that had previously been utilized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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